2 * EIGRP Sending and Receiving EIGRP SIA-Query Packets.
3 * Copyright (C) 2013-2014
11 * This file is part of GNU Zebra.
13 * GNU Zebra is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2, or (at your option) any
18 * GNU Zebra is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; see the file COPYING; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
36 #include "sockunion.h"
44 #include "eigrpd/eigrp_structs.h"
45 #include "eigrpd/eigrpd.h"
46 #include "eigrpd/eigrp_interface.h"
47 #include "eigrpd/eigrp_neighbor.h"
48 #include "eigrpd/eigrp_packet.h"
49 #include "eigrpd/eigrp_zebra.h"
50 #include "eigrpd/eigrp_vty.h"
51 #include "eigrpd/eigrp_dump.h"
52 #include "eigrpd/eigrp_macros.h"
53 #include "eigrpd/eigrp_topology.h"
54 #include "eigrpd/eigrp_fsm.h"
56 /*EIGRP SIA-QUERY read function*/
57 void eigrp_siaquery_receive(struct eigrp
*eigrp
, struct ip
*iph
,
58 struct eigrp_header
*eigrph
, struct stream
*s
,
59 struct eigrp_interface
*ei
, int size
)
61 struct eigrp_neighbor
*nbr
;
62 struct TLV_IPv4_Internal_type
*tlv
;
66 /* increment statistics. */
69 /* get neighbor struct */
70 nbr
= eigrp_nbr_get(ei
, eigrph
, iph
);
72 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
75 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
77 while (s
->endp
> s
->getp
) {
78 type
= stream_getw(s
);
79 if (type
== EIGRP_TLV_IPv4_INT
) {
80 struct prefix dest_addr
;
82 stream_set_getp(s
, s
->getp
- sizeof(uint16_t));
84 tlv
= eigrp_read_ipv4_tlv(s
);
86 dest_addr
.family
= AFI_IP
;
87 dest_addr
.u
.prefix4
= tlv
->destination
;
88 dest_addr
.prefixlen
= tlv
->prefix_length
;
89 struct eigrp_prefix_descriptor
*dest
=
90 eigrp_topology_table_lookup_ipv4(
91 eigrp
->topology_table
, &dest_addr
);
93 /* If the destination exists (it should, but one never
96 struct eigrp_fsm_action_message msg
;
97 struct eigrp_route_descriptor
*entry
=
98 eigrp_route_descriptor_lookup(
100 msg
.packet_type
= EIGRP_OPC_SIAQUERY
;
102 msg
.data_type
= EIGRP_INT
;
103 msg
.adv_router
= nbr
;
104 msg
.metrics
= tlv
->metric
;
107 eigrp_fsm_event(&msg
);
109 eigrp_IPv4_InternalTLV_free(tlv
);
112 eigrp_hello_send_ack(nbr
);
115 void eigrp_send_siaquery(struct eigrp_neighbor
*nbr
,
116 struct eigrp_prefix_descriptor
*pe
)
118 struct eigrp_packet
*ep
;
119 uint16_t length
= EIGRP_HEADER_LEN
;
121 ep
= eigrp_packet_new(EIGRP_PACKET_MTU(nbr
->ei
->ifp
->mtu
), nbr
);
123 /* Prepare EIGRP INIT UPDATE header */
124 eigrp_packet_header_init(EIGRP_OPC_SIAQUERY
, nbr
->ei
->eigrp
, ep
->s
, 0,
125 nbr
->ei
->eigrp
->sequence_number
, 0);
127 // encode Authentication TLV, if needed
128 if ((nbr
->ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
129 && (nbr
->ei
->params
.auth_keychain
!= NULL
)) {
130 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, nbr
->ei
);
133 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe
);
135 if ((nbr
->ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
136 && (nbr
->ei
->params
.auth_keychain
!= NULL
)) {
137 eigrp_make_md5_digest(nbr
->ei
, ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
141 eigrp_packet_checksum(nbr
->ei
, ep
->s
, length
);
144 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
146 /*This ack number we await from neighbor*/
147 ep
->sequence_number
= nbr
->ei
->eigrp
->sequence_number
;
149 if (nbr
->state
== EIGRP_NEIGHBOR_UP
) {
150 /*Put packet to retransmission queue*/
151 eigrp_fifo_push(nbr
->retrans_queue
, ep
);
153 if (nbr
->retrans_queue
->count
== 1) {
154 eigrp_send_packet_reliably(nbr
);
157 eigrp_packet_free(ep
);